How can I apply tinted polyurethane over clear polyurethane for a desired finish?

To apply tinted polyurethane over clear polyurethane for a desired finish, first sand the surface lightly to create a good bonding surface. Then, apply the tinted polyurethane in thin, even coats, allowing each coat to dry completely before applying the next one. Make sure to follow the manufacturer's instructions for drying times and application techniques.